256 CU L T V A E OF T H E (j /,' A P E. 



grapery, they can be killed by fumigating with tobacco, 

 which is a specific for all plant-lice. They are tenacious 

 of life, however; and it will generally require two or three 

 smokings to effectually clear a house. In the open air, 

 tobacco-water and a suds of whale-oil soap are the reme- 

 dies which can most easily be applied. A strong decoc- 

 tion of tobacco, syringed upon the foliage, is usually 

 effectual in driving them away, though it does not kill 

 them. Whale-oil soap would also probably prove effica- 

 cious if used in June, when the thrip first appears in its 

 larva state. If allowed to mature, neither tobacco nor 

 soap will prove effectual in the open air. Fessenden, in 

 " The American Gardener," suggests movable tents, to be 

 placed over the trellis, so that tobacco-smoke can be 

 applied. This might be done during the early stage of 

 the insect ; but, when it has acquired wings, it would find 

 no inconvenience whatever in shifting its quarters as 

 the tent advanced. The movement of the tent would 

 prove too slow for these saltatory larvae. They dance 

 to quicker music. 



Dr. Grider, President of the East-Pennsylvania Fruit- 

 growers' Society, recommends carrying lighted torches 

 under the vines at night. He says the thrip, being 

 attracted by the light, flies into the fire, and is killed. 



